When a Spell Card is activated: Discard 1 Spell Card; negate the activation, and if you do, destroy it, and if you do that, your opponent cannot activate Spell Cards with that name for the rest of this Duel.
Bringing multiple copies of useful spell cards like Enemy Controller, or Super Rush Headlong are quite common. Cursed Seal will negate 1 of them, and make the other copies they have become a dead card.
Most people often bring multiple Enemy Controllers due to its versatile use, but they are often used to switch your monster to defense. While this can end up being bad for you if your monster's defense is low and will get destroyed easily, if you are not going to lose the fight, then it's better not to negate them. A lot of decks can have more threatening spell cards like Super Rush that destroys your monster, or ritual summoning strong ritual monsters, and whatever the new meta breaking spell cards may be, so it's better to be conservative about using Cursed Seal, even if you bring multiple of these in order to not be left with low cards in hand.
You can already make a deck around using counter traps. Monsters like Van'Dalgyon and Dark Voltanis can be special summoned when you use them, and Bountiful Artemis for more draw power. Other useful counter traps that you can bring can be Trap Jammer, or Anti-Magic Prism.
Discards for cost
Negates the activation of Spell Cards / Destroys Spell Cards
I Was playing a mirror match using Vampires, opponent already set the Vamp field spell the previous turn. Current turn I had curse of the forbidden seal set and had an extra spell card in my hand...he plays Vampire Grace and uses her effect, which in turn activates (is there a difference between initial activation and post initial activations?) the vampire field Spell. I get no option to negate the field spell or use curse of the forbidden spell. Is it bugged or does it not work after first activation?
It's worth noting that NO Counter Trap in Duel Links is capable of being chained to a Spell effect, only the activation of a Spell Card. (Indeed, even the TCG only has ONE Counter Trap that can.) That applies to ones that don't negate activations as well, such as Trap of Board Eraser.
This card is so underrated in the current meta. It alone beats Spellbooks, Dheroes and fur hire's e-con.
Yes specially the first two, im new and don't have the card yet but while browsing the the super rare cards thought the same, it should in theory shit on those decks that rely heavily on a "do everything" kind of spell
Sometimes I'll use this instead of TTH in a trapless deck, feels great when you use it and your opponent just pauses for a lil bit
I used this against Machine Angel Ritual while farming Alexis Lv 40. She immediately used a second Machine Angel Ritual, which should not be possible. I tested another time, and it happened again. Anyone else have this issue?